#include <iostream>
#include <string>
using namespace std;

int main()
{
	string s;
	getline(cin, s);
	int i = 0;
	for (i = 0; i < s.size(); i++)
	{
		if ((s[i] >= 'b' && s[i] <= 'z') || (s[i] >= 'B' && s[i] <= 'Z'))
			s[i] -= 1;
		else if (s[i] == 'a')
			s[i] = 'z';
		else if (s[i] == 'A')
			s[i] = 'Z';
	}
	cout << s << endl;
	
	return 0;
}

